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-fno-builtin-function doesn't work?
- From: Pan ruochen <panruochen at gmail dot com>
- To: binutils at sourceware dot org
- Date: Mon, 19 Apr 2010 15:19:03 +0800
- Subject: -fno-builtin-function doesn't work?
Hi All,
I was developing with uclibc libarary and came across some linking problems.
$cat 1.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
int main(int argc, char *argv[])
{
double a, b, x;
x = rand();
a = sin(x) * cos(x);
printf("%lf %lf\n", a, b);
return 0;
}
$mips-linux-gnu-gcc -mips32r2 -EL -O2 -muclibc -msoft-float 1.c
/tmp/ccufhMGF.o: In function `main':
1.c:(.text+0x28): undefined reference to `sincos'
1.c:(.text+0x38): undefined reference to `sincos'
collect2: ld returned 1 exit status
Since the uclibc libraries don't contain the `sincos' functions, I
tried to prevent gcc from producing `sincos'
$mips-linux-gnu-gcc -mips32r2 -EL -O2 -muclibc -msoft-float
-fno-builtin-sincos -fno-builtin-sincosf -fno-builtin-sincosl 1.c
/tmp/ccufhMGF.o: In function `main':
1.c:(.text+0x28): undefined reference to `sincos'
1.c:(.text+0x38): undefined reference to `sincos'
collect2: ld returned 1 exit status
It seemed that -fno-builtin-function doesn't really disable one single
built-in function.
Best Regards,
PRC
Apr 19,2010